Do not let user names Jbird343. He is the leader of a greifing team that goes into random servers and uses edited mods to allow themselves items without op. The stupid thing this user does is tapes a video and posts on youtube. This video is of JBird343 greifing in my friends server, I know it's my friends because I recognize the entire level (my house is only like 50 blocks away from where he is greifing...
Do not let this person in!